Volume : 2, Issue : 5, May - 2013

Vibration Analysis of Lathe Machine

Nemisha Goswami, Prof. Dr. K. G. Dave, A. V. Prajapati

Abstract :

Unwanted viation in machine tools like milling, lathe, grinding machine is one of the main problem as it affects the quality of the machined parts, tool life and noise during machining operation. Hence these unwanted viations are needed to be suppressed or damped out while machining. Therefore the present work concentrates and aims on study of different controllable parameter that affect the responses like viation amplitude. The prediction of viation between the tool and work piece is important as guideline to the machine tools user for an optimal selection of depth of cut and spindle rotation to minimize the viation. This can be done by different approaches. In this work, an experimental method is applied in which the time varying dynamic turning forces are expanded in Fourier series. The forces in contact zone between tool and work piece during the cut are evaluated by an algorithm using FFT analyzer and a dynamometer located between the work piece material and cutter geometry. The modal parameters of the machine, work piece and tool system like natural frequencies, velocity and acceleration must be identified experimentally. By using FFT analyzer it is possible to plot the frequencies, velocity and acceleration to the dynamic system. These curves relate the spindle speed with depth of cut, separating stable and unstable zone, allowing the selection of cutting parameters resulting maximum productivity and minimize the viation